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Loans - Deferrals (Details) $ in Millions	3 Months Ended
	Sep. 30, 2020 security	Sep. 30, 2021 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of deferrals | security	0
Payment Deferral | COVID-19 Modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-TDR loan modifications due to COVID-19 | $		$ 3.0

X

- Definition

Financing Receivable, Modifications, Balance

+ References

No definition available.

+ Details

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Namespace Prefix:	inbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: